2 * Copyright © 2012 Keith Packard <keithp@keithp.com>
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; version 2 of the License.
8 * This program is distributed in the hope that it will be useful, but
9 * WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * General Public License for more details.
13 * You should have received a copy of the GNU General Public License along
14 * with this program; if not, write to the Free Software Foundation, Inc.,
15 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
18 #include <ao_ms5607.h>
21 ao_ms5607_convert(struct ao_ms5607_sample *sample, struct ao_ms5607_value *value)
28 dT = sample->temp - ((int32_t) ms5607_prom.tref << 8);
30 TEMP = 2000 + (((int64_t) dT * ms5607_prom.tempsens) >> 23);
33 OFF = ((int64_t) ms5607_prom.off << 16) + (((int64_t) ms5607_prom.tco * dT) >> 7);
34 SENS = ((int64_t) ms5607_prom.sens << 15) + (((int64_t) ms5607_prom.tcs * dT) >> 8);
36 OFF = ((int64_t) ms5607_prom.off << 17) + (((int64_t) ms5607_prom.tco * dT) >> 6);
37 SENS = ((int64_t) ms5607_prom.sens << 16) + (((int64_t) ms5607_prom.tcs * dT) >> 7);
41 int32_t T2 = ((int64_t) dT * (int64_t) dT) >> 31;
42 int32_t TEMPM = TEMP - 2000;
43 int64_t OFF2 = (61 * (int64_t) TEMPM * (int64_t) TEMPM) >> 4;
44 int64_t SENS2 = 2 * (int64_t) TEMPM * (int64_t) TEMPM;
46 int32_t TEMPP = TEMP + 1500;
47 int64_t TEMPP2 = TEMPP * TEMPP;
48 OFF2 = OFF2 + 15 * TEMPP2;
49 SENS2 = SENS2 + 8 * TEMPP2;
56 value->pres = ((((int64_t) sample->pres * SENS) >> 21) - OFF) >> 15;